Exhaust-steam injector



May 20, 1930; E. BLAUHORN EXHAUST STEAM INJECTOR Filed Sept. 22. 1927fmflde/ fi/aafiarp I N VEN TOR.

ATTORNEY.

Patented May 20, 1930 UNITED STATES EMANUEL IBLAUI-IORN,

or VIENNA, AUstrnIA EXHAUST-STEAM INJECTOR Application filed September22, 1927, Serial No. 221,381, and in Austria February 5, 1927."

The subject of this invention is a modification of the exhaust steaminjector described in the application for United States patent, filed byHans Deutsch, September 15, 1927,

under Serial Number 219,7 39, having an annular nozzle fed with livesteam and enclosing the exhaust steam nozzle.

The arrangement there disclosed has the disadvantage, particularly withsmaller sizes, that the annular space between the exhaust steam nozzleand the annular nozzle is rapidly worn out by the action of the steamflowing through this narrow section, the function of the apparatus beingthereby injured as the exact cross-sectional area is important. Thepresent invention therefore has the object of providing a form of theapparatus in which thisdifliculty is removed.

The underlying thought is to permit the an- 0 nular nozzle to functiononly at those periods at which it performs its principal purpose, whichis to ensure starting of the injector even after air or certain amountsof steam have entered through the exhaust steam connections; while at.all other periods while the injector is in operation the entrance ofsteam to the nozzle is prevented, so that even when no exhaust steam ispresent the live steam replacing it reaches the injector only throughthe ordinary path but not through the lifting nozzle.

As the periods of time in which the lifting nozzle is in action willthus be only very brief, the wear on the cross-sectional area will be sosmall even without taking any particular precautions that it may bedisregarded.

This inventive idea is most advantageously carried out by giving asuitable form to the arrangement which regulates the admission of theauxiliary live steam to the injector. The form given to this arrangementis such that the admission of the auxiliary live steam to the liftingnozzle and to the exhaust steam space can occur only alternately, insuch a way that each time the valve is manipulated the live steam pathto the lifting nozzle is first opened and then this path issimultaneously closed off while the path for the live steam into theexhaust steam space is opened so that the lifting of the feed water isalways first assured in the manner described below when the injector ischanged over from exhaust steam operation to operation with expandedlive' steam.

The drawings illustrate the subject-matter of the invention appliedto aninjector of the general type disclosed in UnitedStates Patents Nos.944,455 and 1,342,128 granted De 69' T cember 28, 1909 and June 1, 1920respectively, to J. C. Metcalfe, et "al., modified to in V clude thelifting feature disclosed in the Deutsch application referred to. It isto be understood, however, that the present invention may also beapplied to exhaust steam injectors, the specific details of which difierfrom'those disclosed in the Metcalfe patents. Fig. 1 is a diagrammaticview of'an injector and control valve assembly in which the pres: 70

ent invention is incorporated, while Figs i 2 and 3 are enlarged detailsofanillustrative form ofthe control valveembodying the invention in itstwo'main positions.

In the injector'shown in Fig. 1 the nozzle 8, fed from the steam space 3to which exhaust steam is admitted through valve 3 ,issur-f rounded bythe annular nozzle 9 which acts on the Water space 4 the latter beingsupplied from the Water pipe 19. Thisnozzle is sup, plied with livesteam by its own supply pipe, 20 while the auxiliary live steam iscarried" to the exhaust steam space 3 through the passage 18. I p 1 FThe valve, however, which controls the steam path to the passages 18 and20, is provided with an extension in the form of a hollow piston or.whose wall is provided with openings 6, b and 0, 0 of which the openings0, c communicate with the path 20 when the valve 16 is in its lowestposition, while the openings 6, b communicate with the path 18 when thevalve is opened. In the latter position the openings 0, 0 are closed.

Fig. 2 shows the position of this controlling valve when the valve 16 isjust beginning to open. Steam flows through the passage 2, 7 under theseat of the valve into the hollow A piston to the openings 0, 0 andthrough these into the steam path 20 whence it reaches the PAT N canoe flifting nozzle 9. This current of steam then lifts the water whichreaches the water space 4 of theinjector through the water pipe 19. Witha further opening of the valve 16 the piston assumes the position ofFig. 3 in which the flow of steam to the liftingnozzle ceases and theway is opened through pipe 18 to the ex- I haust steam space 310i theinjector, where this expanded auxiliary live steam, replacing theexhaust steam, assures the action of the injector in the ordinary way inconnection with the live steam flowing through thenozzle 7.

The form of the controllingvalve herein illustratedhas the advantagethat it controls with a single apparatus not only the opening of thelive steam path itself, but also several other pathsin theproper orderand in addi tion makesit possible by the proper dimensio ning of theopenings in the wall of: the

V 2o vnve m secure the required throttling down of the steam 'for eachof the passages. Through this co-action of the solid valve and itssleeve portion, it now becomes unnecessary to pack the latter so thatthe construction is very simple. I V

I claim: I v r v 1. In an injector of the class described, thecombination of amai-n low pressure steam nozzle, a steam spacecommunicating therewith, a high pressure lifting nozzle surroundingsaidmainnozzle, conduits to supply said steam space and said liftingnozzlewith live steam, and valve means for admitting live steam to saidconduits in alternation only. 2.; A combination according to claim 1,the

valve means being so arranged that the flow through the conduitto'thehigh pressure lifting n'oz live steam. Y, 7 v

3. A combination according to claim 1, the

, valve means comprising a disc to close the entranceto both conduits,and a hollow piston with openings to admit steam to its interior and topermit flow from its interior-to the two conduits.

A combination according to claim 1, the valve means comprising a hollowpiston with an opening to admit steam to its interior and openings topermit flow from'its interior to the two conduits, the latter openingsbeing of such dimensions as to throttle the live steam down by therequired amount.

7 EMANUEL BLAUHORN.

zle is alwaysopened first on admitting

